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0. W. HUNT. VALVE GEAR FOR STEAM ENGINES.

No. 437,928. Patented Oct. 7. 1890.

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UNITED STATES PATENT OFFICE.

CHARLES XV. HUNT, OF WEST NEYV BRIGHTON, ASSIGNOR TO THE C. W. HUNT COMPANY, OF NEW YORK, N. Y.

VALVE-GEAR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 437,928, dated October 7, 1890.

Application filed February 3, 1890. Serial No. 339,082. (No model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES \V. HUNT, a citizen of the United States, residing at Vest New Brighton, in the county of Richmond and State of New York, have invented an Improvement in Valve-Gears for Steam-Engines, of which the following is a specification.

The present invention relates to a valvegear in which the valve receives its motion from levers and links and can be moved to cause the engine to revolve in either one direction or the other or to stop.

In the drawings, Figure l is an elevation of the valve-gear. Fig. 2 is a diagram illustrating the positions of the parts and the lines of movement. Fig. 3 is a section representing the relative positions of the piston and the links extending from the cross and connecting rod. Fig. 4 is aplan View of the connections to the valve-rod, and Fig. 5 is a diagram representing a modification.

The cylinder A, piston-rod B, cross-head O,

. and connecting-rod D to the crank-pins 3, and

crank C are of ordinary character. The connecting-rod D has a downwardly-projecting arm D,t which one end of the link E is connected, that extends to the rocker F, and there is a second link L connecting this rocker F with the cross-head O. The rocker F is pivoted to and suspended by a radius-bar G, and this radius-bar is connected by the joint or pivot 4 to the valve-rod N, and such val ve-rod passes through the slide N, so that its outer end is supported. It may be preferable to fork the valve'rod N and the radius-bar G, as seen in Fig. 4:, so that the actuatinglink His pivoted at within the jaw of the radius-bar G, and so that the strain comes in one line. The end of the rocker F is connected to the link K, in order to give the arm H a vibratory motion upon the center 5.

At the end of the link H is a block P, which slides within the slotted sector 0 or its equivalent. The sector 0 may occupy the position shown in Fig. 1, or it may be moved into the position indicated by the dotted lines 7 or 8, Fig. 2.

By reference to the diagram Fig. 2 it will be understood that when the engine is in motion the pivot 2 of the rocker F will swing in the arc of a circle, and the joint 10 of the rocker F will describe the figure of a crescent, as indicated by the dotted lines, Fig. 2, and in so doing the link H may be swung up and down upon the are of the circle 11, which being described from the joint 5 will not cause the link H to move endwise, but in consequence of the joint 4: of the radius-bar G being at a little distance from the joint 5 the valve-rod will receive a slight endwise motion which is to be sufficient for the lap and lead of the valve. It now the sector 0 is moved into the position indicated by the dot ted lines 7, an endwise motion will be given'to the link H by such sector, and the valve will be moved for the engine to rotate in one direction, and if the slotted sector 0 is moved into the position indicated by the dotted lines 8, Fig. 2, the motion given to the valve will cause the engine to rotate in the other direction, the movement in either instance being given by the slotted sector 0 and the block P that slides therein in consequence of the swinging motion given to the link H by the link K, as the lower end of the link K at the joint 10 is caused to describe acrescent shape by the movement of the connectingrod, cross-head links, and rocker, as aforesaid.

By the diagram Fig. 5 it will be understood that a link 0 may take the place of and be the equivalent of the sector. In this case the link is of the same length as theradius of the sector, and by moving the pivot of the link to the point the joint 16 will describe the are 7, and by moving such pivot 15 to the point 18 the joint 16 will describe the are 8, and the operations will be the same as before described.

It will be evident that in this valve motion there are two parallelograms O D 2 12 and 2 1O 5 17, and these acting together cause the link H to swing and remain parallel, or nearly parallel, with the connecting-rod D, as the latter is carried up and down with the crank 0 and the movement given to the valve is similar to that from an eccentric.

I claim as my invention 1. The combination, with the valve rod supported at its outer end, of the radius-bar G, pivoted to the end of the valve-rod, and

lap and lead movement, the sector 0 or its equivalent for moving the link H endwise, anda connection to the connecting-rod for swinging the link H laterally, substantially as set forth.

Signed by me this 25th day of January, 1890.

CHAS. \V. HUNT.

Witnesses:

GEo. T. PINCKNEY, WILLIAM G. MOTT. 

